APA (7e ed.) Bronvermelding

Fredrickson,Barbara. Positivity: Groundbreaking research to release your inner optimist and thrive. One World.

Chicago (17e ed.) Bronvermelding

Fredrickson,Barbara. Positivity: Groundbreaking Research to Release Your Inner Optimist and Thrive. One World.

MLA (8e ed.) Bronvermelding

Fredrickson,Barbara. Positivity: Groundbreaking Research to Release Your Inner Optimist and Thrive. One World.

Let op: Deze citaties zijn niet altijd 100% accuraat.